Semiconductor integrated circuit device

Details Semiconductor integrated circuit device Semiconductor integrated circuit device

1998-02-25

2000-12-26

Tokar, Michael

Electronic digital logic circuitry

Interface

Current driving

326 93, H03K 190185

Patent

active

061665622

ABSTRACT:
A driving voltage supplied to a semiconductor integrated circuit can be controlled. The semiconductor integrated circuit device provided with a voltage converter circuit comprises: a buffer circuit having: a P-channel MOS transistor having a source connected to a first supply voltage; and an N-channel MOS transistor having a source connected to a second supply voltage and a drain connected to a drain of the P-channel MOS transistor, an output voltage being outputted from a common-connected drain terminals of the two MOS transistors; a duty ratio control circuit having: a counter for outputting a first n-bit signal by repeatedly counting up numbers from 0 to (2.sup.n -1) one by one in synchronism with a first clock signal; and a comparator circuit for comparing the first n-bit signal with a second n-bit signal applied from the outside, and for outputting a first control signal to a gate of the P-channel MOS transistor and a second control signal to the N-channel MOS transistor; and a smoothing circuit for smoothing the output of the buffer circuit, a voltage smoothed by the smoothing circuit being outputted as an output of the voltage converter circuit.

REFERENCES:
patent: 5254883 (1993-10-01), Horowitz et al.
patent: 5568068 (1996-10-01), Ota et al.
patent: 5870401 (1999-02-01), Riley
patent: 6005422 (1999-12-01), Morinaka et al.
patent: 6047346 (2000-04-01), Lau et al.

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